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My iPhone? , ] To get the price of a surroundings, we have to use subscripting (for instance, defaultSettings[? identify? ]). Dictionary look up continually returns an not obligatory worth. whilst the price doesn’t exist, it returns nil rather than a crash. distinction this with arrays, which crash. The reasoning at the back of this distinction in interfaces is that dictionaries are sparse (and will frequently now not include a cost for a key), while array indexing is anticipated to be triumphant. we are going to pass into extra aspect approximately this tradeoff on the finish of this bankruptcy. fast makes a contrast among values that may be nil (optional values) and values which may by no means be nil (normal values). we'll speak extra approximately that during the bankruptcy on optionals. Mutation similar to with arrays, dictionaries outlined utilizing permit are immutable: no entries could be additional or replaced. And similar to with arrays, we will outline a mutable variation utilizing var. to take away a price from a dictionary, we will simply set it to nil. If we wish to take an immutable dictionary and make alterations to it, we need to keep a copy: var localizedSettings = defaultSettings localizedSettings[? identify? ] = ? Mein iPhone? localizedSettings[? don't Disturb? ] = actual enable oldName = localizedSettings. updateValue(? My iPhone? , forKey: ? identify? ) // ? Mein iPhone? There are different integrated collections to boot. there's Set, that are bridged to NSSet. There’s diversity, which describes a variety of consecutive index values. There’s Repeat, that is a suite that includes an analogous worth a number of occasions. lets even reflect on non-compulsory, a set with a greatest of 1 point. a few worthwhile Dictionary Extensions One beneficial extension that we will write ourselves is merging dictionaries. for instance, whilst showing the settings to the consumer, we wish to merge people with the settings that the consumer has saved. To learn the settings, there's the functionality storedSettings: func storedSettings() -> [String:Setting] { we will be able to upload a merge functionality on dictionaries. Dictionaries comply with the SequenceType protocol, and via making the strategy common, we will merge in dictionaries, but additionally the other variety that conforms to SequenceType and will generate (Key,Value) pairs: extension Dictionary { mutating func merge(other: S) { for (k, v) in different { self[k] = v } } } we will use this to merge our continued settings into the default settings: var settings = defaultSettings settings. merge(storedSettings()) one other fascinating extension is making a dictionary from a series of (Key, worth) pairs. we will begin with an empty dictionary after which simply merge within the series. This uses the merge strategy outlined above to do the heavy lifting: extension Dictionary { init(_ series: S) { self = [:] self. merge(sequence) } } // All alarms are became off through default enable defaultAlarms = (1.. <5). map { (? Alarm \($0)? , fake) } allow alarmsDictionary = Dictionary(defaultAlarms) eventually, a final important extension is a map over the values of the dictionary.